1 /* 2 * Copyright © 2016 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 * 23 * 24 */ 25 #include <drm/drm_edid.h> 26 #include <drm/drm_atomic_helper.h> 27 #include <drm/drm_dp_dual_mode_helper.h> 28 #include "intel_drv.h" 29 30 static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon) 31 { 32 struct intel_digital_port *dig_port = 33 container_of(lspcon, struct intel_digital_port, lspcon); 34 35 return &dig_port->dp; 36 } 37 38 static const char *lspcon_mode_name(enum drm_lspcon_mode mode) 39 { 40 switch (mode) { 41 case DRM_LSPCON_MODE_PCON: 42 return "PCON"; 43 case DRM_LSPCON_MODE_LS: 44 return "LS"; 45 case DRM_LSPCON_MODE_INVALID: 46 return "INVALID"; 47 default: 48 MISSING_CASE(mode); 49 return "INVALID"; 50 } 51 } 52 53 static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon) 54 { 55 enum drm_lspcon_mode current_mode; 56 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 57 58 if (drm_lspcon_get_mode(adapter, ¤t_mode)) { 59 DRM_ERROR("Error reading LSPCON mode\n"); 60 return DRM_LSPCON_MODE_INVALID; 61 } 62 return current_mode; 63 } 64 65 static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon, 66 enum drm_lspcon_mode mode) 67 { 68 enum drm_lspcon_mode current_mode; 69 70 current_mode = lspcon_get_current_mode(lspcon); 71 if (current_mode == mode || current_mode == DRM_LSPCON_MODE_INVALID) 72 goto out; 73 74 DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n", 75 lspcon_mode_name(mode)); 76 77 wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode || 78 current_mode == DRM_LSPCON_MODE_INVALID, 100); 79 if (current_mode != mode) 80 DRM_DEBUG_KMS("LSPCON mode hasn't settled\n"); 81 82 out: 83 DRM_DEBUG_KMS("Current LSPCON mode %s\n", 84 lspcon_mode_name(current_mode)); 85 86 return current_mode; 87 } 88 89 static int lspcon_change_mode(struct intel_lspcon *lspcon, 90 enum drm_lspcon_mode mode) 91 { 92 int err; 93 enum drm_lspcon_mode current_mode; 94 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 95 96 err = drm_lspcon_get_mode(adapter, ¤t_mode); 97 if (err) { 98 DRM_ERROR("Error reading LSPCON mode\n"); 99 return err; 100 } 101 102 if (current_mode == mode) { 103 DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n"); 104 return 0; 105 } 106 107 err = drm_lspcon_set_mode(adapter, mode); 108 if (err < 0) { 109 DRM_ERROR("LSPCON mode change failed\n"); 110 return err; 111 } 112 113 lspcon->mode = mode; 114 DRM_DEBUG_KMS("LSPCON mode changed done\n"); 115 return 0; 116 } 117 118 static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon) 119 { 120 uint8_t rev; 121 122 if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV, 123 &rev) != 1) { 124 DRM_DEBUG_KMS("Native AUX CH down\n"); 125 return false; 126 } 127 128 DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n", 129 rev >> 4, rev & 0xf); 130 131 return true; 132 } 133 134 static bool lspcon_probe(struct intel_lspcon *lspcon) 135 { 136 enum drm_dp_dual_mode_type adaptor_type; 137 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 138 enum drm_lspcon_mode expected_mode; 139 140 expected_mode = lspcon_wake_native_aux_ch(lspcon) ? 141 DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS; 142 143 /* Lets probe the adaptor and check its type */ 144 adaptor_type = drm_dp_dual_mode_detect(adapter); 145 if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) { 146 DRM_DEBUG_KMS("No LSPCON detected, found %s\n", 147 drm_dp_get_dual_mode_type_name(adaptor_type)); 148 return false; 149 } 150 151 /* Yay ... got a LSPCON device */ 152 DRM_DEBUG_KMS("LSPCON detected\n"); 153 lspcon->mode = lspcon_wait_mode(lspcon, expected_mode); 154 lspcon->active = true; 155 return true; 156 } 157 158 static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon) 159 { 160 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon); 161 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); 162 struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev); 163 unsigned long start = jiffies; 164 165 while (1) { 166 if (intel_digital_port_connected(dev_priv, dig_port)) { 167 DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %lu ms\n", 168 jiffies_to_msecs(jiffies - start)); 169 return; 170 } 171 172 if (time_after(jiffies, start + msecs_to_jiffies(1000))) 173 break; 174 175 usleep_range(10000, 15000); 176 } 177 178 DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n"); 179 } 180 181 void lspcon_resume(struct intel_lspcon *lspcon) 182 { 183 enum drm_lspcon_mode expected_mode; 184 185 if (lspcon_wake_native_aux_ch(lspcon)) { 186 expected_mode = DRM_LSPCON_MODE_PCON; 187 lspcon_resume_in_pcon_wa(lspcon); 188 } else { 189 expected_mode = DRM_LSPCON_MODE_LS; 190 } 191 192 if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON) 193 return; 194 195 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON)) 196 DRM_ERROR("LSPCON resume failed\n"); 197 else 198 DRM_DEBUG_KMS("LSPCON resume success\n"); 199 } 200 201 void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon) 202 { 203 lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON); 204 } 205 206 bool lspcon_init(struct intel_digital_port *intel_dig_port) 207 { 208 struct intel_dp *dp = &intel_dig_port->dp; 209 struct intel_lspcon *lspcon = &intel_dig_port->lspcon; 210 struct drm_device *dev = intel_dig_port->base.base.dev; 211 struct drm_i915_private *dev_priv = to_i915(dev); 212 213 if (!IS_GEN9(dev_priv)) { 214 DRM_ERROR("LSPCON is supported on GEN9 only\n"); 215 return false; 216 } 217 218 lspcon->active = false; 219 lspcon->mode = DRM_LSPCON_MODE_INVALID; 220 221 if (!lspcon_probe(lspcon)) { 222 DRM_ERROR("Failed to probe lspcon\n"); 223 return false; 224 } 225 226 /* 227 * In the SW state machine, lets Put LSPCON in PCON mode only. 228 * In this way, it will work with both HDMI 1.4 sinks as well as HDMI 229 * 2.0 sinks. 230 */ 231 if (lspcon->active && lspcon->mode != DRM_LSPCON_MODE_PCON) { 232 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) { 233 DRM_ERROR("LSPCON mode change to PCON failed\n"); 234 return false; 235 } 236 } 237 238 if (!intel_dp_read_dpcd(dp)) { 239 DRM_ERROR("LSPCON DPCD read failed\n"); 240 return false; 241 } 242 243 drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd)); 244 245 DRM_DEBUG_KMS("Success: LSPCON init\n"); 246 return true; 247 } 248